Hi all
Finally I have decided to start blogging and for a start I will just post about my experiences in the rat race called Campus Placements .
Today we had Inmobi on campus . Its a very fast growing mobile ads company . They make use of cutting edge technologies to provide ad services to their client by seamlessly integrating the ads in the mobile internet . With the ever growing pace of smartphones and the new 3G services , this company surely has a bright future .
They intially presented a slideshow about their company Inmobi Profile . Then they had a written test for 90 minutes . The paper had four sections .
Section 1
1. Given a Linked list with a loop , the head pointer and another node . How do u remove the loop .
2. Using the Trie Data structure to implement a small intranet search engine . They asked us to implement a function to add a page to the search space and another function to return an array of strings containing the pages .
3. A problem on using adjacency list to find the minimum number of traffic policemen required for a patrolling traffic on a junction of roads .
4. A function to find loop within a linked list was given . We had to find 2 logical errors in it and give a proper solution.
Section 2
Some more problems on programming . To find errors , testcases , output etc etc . I dont remember right now . Will update tomorrow .
Section 3 - Unix
This was my favourite part of the paper . So I will also give my answers here :)
1. Which of these is not a shell ?
a. bash b.tcsh c.xterm d.zsh
Answer : c.xterm - it is just a terminal emulation for X window System .
2. What is crom ? what are the default fields in crontab ?
Cron is the job scheduler in unix . We can specify the commands to be run at a particular time and it automatically runs it .
These details need to be given in the crontab . I don't know the exact fields , but I guess it will atleast have 2 fields - the command to be run and the time .
3. Why do we give #/bin/sh at the beginning of shell scripts even though we know that # means that the line is a comment ?
This is used to specify the interpreter which the shell must use to run the script. It tells the path from where the interpreter needs to be invoked .
Ex : #!/bin/sh - invokes bash #!/bin/ksh -invokes korn shell
4. What is the output of the following in perl - $a = 2 ; $b=3 ; $x = "$a.$b" ; print $x; ?
I completely screwed this up :( In perl dot is used as a concatentation operator but since it is used within double quotes the answer is 2.3 .
5. What is inode ? What is its importance ?
6. What is pipe ? How is it used ?
7. What is the difference between the following "tail -30f myfile.txt " , "tail -f myfile.txt " and "tail -30 myfile.txt " ?
8.What are Sticky bits ? How are they used ?
9 . Suppose U log in to a unix system , how can u print ur username ?
a. who am i b. id c. whoami d.all do the same
I wrote c. whoami because of the following
umesh@ubuntu:~$ who am i
umesh pts/4 2010-09-01 23:37 (:0.0)
umesh@ubuntu:~$ whoami
umesh
umesh@ubuntu:~$ id
uid=1000(umesh) gid=1000(umesh) groups=4(adm),20(dialout),24(cdrom),46(plugdev),104(fuse),105(lpadmin),119(admin),122(sambashare),1000(umesh)
10 . What is the difference between the following : date;who >MyLogFile and (date;who)>MyLogFile ?
To be continued after i recall
6. What is pipe ? How is it used ?
7. What is the difference between the following "tail -30f myfile.txt " , "tail -f myfile.txt " and "tail -30 myfile.txt " ?
8.What are Sticky bits ? How are they used ?
9 . Suppose U log in to a unix system , how can u print ur username ?
a. who am i b. id c. whoami d.all do the same
I wrote c. whoami because of the following
umesh@ubuntu:~$ who am i
umesh pts/4 2010-09-01 23:37 (:0.0)
umesh@ubuntu:~$ whoami
umesh
umesh@ubuntu:~$ id
uid=1000(umesh) gid=1000(umesh) groups=4(adm),20(dialout),24(cdrom),46(plugdev),104(fuse),105(lpadmin),119(admin),122(sambashare),1000(umesh)
10 . What is the difference between the following : date;who >MyLogFile and (date;who)>MyLogFile ?
To be continued after i recall
Section 4 - Puzzles
1. Some simple question on father,son,daughter,brother relations kind of question
2. Questions on probability
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10 . Function to check if a number is power of 2 without using modulus operator % ?
